population at risk

population at risk

a group of people who share a characteristic that causes each member to be susceptible to a particular event, such as nonimmunized children who are exposed to poliovirus or immunosuppressed people who are exposed to herpesvirus. Also called vulnerable population.

population

all of the animals in a specifically defined area considered as a whole. The population may also be defined in modes other than geography, e.g. the cow population, a species specification, the nocturnal bird population.

deals with the frequency of occurrence of inherited characteristics in a population.

infinite population

cannot be examined as a total population because they may never actually exist but are capable of statistical importance.

population limitation

restricting the growth of an animal population by desexing, by culling or by managemental means of interfering with reproduction.

population mean

the mean of the population.

population numbers

see population size (below).

open population

one in which immigration in and out is unrestrained.

parent population

the original population about which it is hoped to make some inferences by examination of a sample of its constituent members.

population proportion

the percentage of the population that has the subject characteristics.

population pyramid

a graphic presentation of the composition of a population with the largest group forming the baseline, the smallest at the apex.

population at risk

see risk population (below).

risk population

the population which is composed of animals that are exposed to the pathogenic agent under discussion and are inherently susceptible to it. Called also population at risk. High or special risk groups are those which have had more than average exposure to the pathogenic agent.

population size

actual counting of a total population, the census method, is not often possible in large animal populations. Alternatives are by various sampling techniques including area trapping, the trapping of all animals in an area, the capture-release-recapture method, the nearest neighbor and line transect methods,

The population size is expressed as the population present at a particular instant. Alternatively it can be expressed as an animal-duration expression when the population is a shifting one and it is desired to express the population size over a period (e.g. cow-day).

stable population

a population which has constant mortality and fertility rates, and no migration, therefore a fixed age distribution and constant growth rate.

target population

in epidemiological terms the population from which an experimenter wishes to draw an unbiased sample and make inferences about it.

For example, the effect of the number of smoked cigarettes on survival may vary markedly from day to day for any single individual, but the average effect of smoking on survival in the population at risk should vary relatively smoothly over time.

Robert Sandhaus, clinical director of the Alpha-1 Foundation, said studies of the Alpha-1 community may well identify environmental and genetic risk factors that apply to the general population at risk for chronic lung or liver disease.

The enthusiastic response of the medical community to the SafeFlo(R) Filter over the past year indicates to us that the market is ready for a versatile and safe optional filter for providing protection to a larger patient population at risk of developing pulmonary embolism," stated Feldman.

When such an attack happens, the first line of immune defense in the attacked individuals should be strengthened with a broad-spectrum therapeutic intervention and the population at risk should be protected with a broad-spectrum antiviral prevention initiative.

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